feat: Add intelligent fallback and memory management to hanzo dev

- Automatic fallback handler tries all available AI options
- Memory persistence with #memory commands (like Claude Desktop)
- Smart context management with priority-based memories
- Session tracking and user preferences
- Export/import memory capabilities
- Enhanced AI responses with contextual awareness
- Version bump to 0.3.20

test_memory.py

@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+"""Test memory management system."""
+
+import asyncio
+import sys
+from pathlib import Path
+from rich.console import Console
+
+# Add src to path
+sys.path.insert(0, str(Path(__file__).parent / "pkg" / "hanzo" / "src"))
+
+from hanzo.memory_manager import MemoryManager, handle_memory_command
+
+def test_memory_manager():
+    """Test memory manager functionality."""
+    console = Console()
+    
+    console.print("\n[bold cyan]Testing Memory Manager[/bold cyan]\n")
+    
+    # Create memory manager
+    memory_manager = MemoryManager("/tmp/test_memory")
+    
+    # Test adding memories
+    console.print("[bold]Adding memories:[/bold]")
+    
+    id1 = memory_manager.add_memory("User prefers Python over JavaScript", type="fact", priority=5)
+    console.print(f"✓ Added fact: {id1}")
+    
+    id2 = memory_manager.add_memory("Always use type hints in Python code", type="instruction", priority=8)
+    console.print(f"✓ Added instruction: {id2}")
+    
+    id3 = memory_manager.add_memory("Working on REST API project", type="context", priority=3)
+    console.print(f"✓ Added context: {id3}")
+    
+    # Test retrieving memories
+    console.print("\n[bold]Retrieving memories:[/bold]")
+    
+    all_memories = memory_manager.get_memories()
+    console.print(f"Total memories: {len(all_memories)}")
+    
+    instructions = memory_manager.get_memories(type="instruction")
+    console.print(f"Instructions: {len(instructions)}")
+    
+    # Test memory commands
+    console.print("\n[bold]Testing memory commands:[/bold]")
+    
+    # Show command
+    console.print("\n#memory show:")
+    handle_memory_command("#memory show", memory_manager, console)
+    
+    # Context command
+    console.print("\n#memory context:")
+    handle_memory_command("#memory context", memory_manager, console)
+    
+    # Test preferences
+    console.print("\n[bold]Testing preferences:[/bold]")
+    
+    memory_manager.set_preference("theme", "dark")
+    memory_manager.set_preference("language", "python")
+    
+    theme = memory_manager.get_preference("theme")
+    console.print(f"Theme preference: {theme}")
+    
+    # Test session messages
+    console.print("\n[bold]Testing session messages:[/bold]")
+    
+    memory_manager.add_message("user", "Hello AI!")
+    memory_manager.add_message("assistant", "Hello! How can I help you today?")
+    
+    recent = memory_manager.get_recent_messages(2)
+    console.print(f"Recent messages: {len(recent)}")
+    
+    # Test AI summary
+    console.print("\n[bold]AI Context Summary:[/bold]")
+    summary = memory_manager.summarize_for_ai()
+    console.print(summary)
+    
+    # Test export/import
+    console.print("\n[bold]Testing export/import:[/bold]")
+    
+    export_file = "/tmp/test_memories.json"
+    memory_manager.export_memories(export_file)
+    console.print(f"✓ Exported to {export_file}")
+    
+    # Create new manager and import
+    new_manager = MemoryManager("/tmp/test_memory2")
+    new_manager.import_memories(export_file)
+    console.print(f"✓ Imported to new manager")
+    
+    imported_memories = new_manager.get_memories()
+    console.print(f"Imported memories: {len(imported_memories)}")
+    
+    console.print("\n[green]✅ All memory tests passed![/green]")
+    
+    return True
+
+if __name__ == "__main__":
+    success = test_memory_manager()
+    sys.exit(0 if success else 1)